Immuno-oncology is increasingly becoming an important therapy for a variety of cancers. As Head of the Division of Hematologic Malignancies and an Attending Physician of the Adult Bone Marrow Transplantation Service, I see patients undergoing a bone marrow transplantation. In my lab, I study novel strategies to improve immune therapies for cancer patients with a special emphasis on the role of the intestinal microbiome in (patho)physiology and therapy, Chimeric Antigen Receptor T cell therapy, and regeneration of thymic function to improve T cell immunity.